As a matter of fact...
Fixed frequency sounds
A part of console driver (do not require sound support).
Documentation:
man console_ioctl (in /usr/man/man4)
"WARNING:
If you use the following information you are going to burn yourself."
(as said in the man page)
/*---------------------------------------*/
/* A sample program to play C major */
/* through a PC speaker */
/*---------------------------------------*/
/* This won't work if standard output is */
/* re-directed to a non-tty device, or */
/* PC speaker wave output is active */
/*---------------------------------------*/
/* M.G. 27-Nov-99 */
/*---------------------------------------*/
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/kd.h>
int main(void)
{
int freq[] = { /* C D E F G A B C */
523, 587, 659, 698, 784, 880, 988, 1046 };
int i;
for (i=0; i<8; i++)
{
ioctl(STDOUT_FILENO, KIOCSOUND, 1193180/freq[i]);
usleep(500000);
}
ioctl(STDOUT_FILENO, KIOCSOUND, 0); /*Stop silly sound*/
return 0;
}
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